Alarm for doors



(No Model.)

N. J. BUSBY.

ALARM FOR BOOKS, &c.

No. 399,242. Patented Mar. 12, 1889.

Fig. 1.

Wat/1e 5 sea,

UNITED STATES PATENT @rrren NAHUM J. BUSBY, OF MAPLINVOOD, MASSiHIIITSETTH.

ALARM FOR DOORS, C.

SEECIFICATION forming part of Letters Patent No. 399,242, dated March 12, 1889.

Application filed April 21, 1888.

Be it know i that l, NAHUM J. B USBY,a citizen oi the l'nii'ed States, residing atMaplewooiil, in the county of Middlescx and State of Massachusetts, have invented certain new and useful Improvements in Alarms for Doors, &o.; 1 and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apperiains to make and use the same, reference being had to the aeeompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Figure l is a front view of the bell-strikinp mechanism it appears without thehell, and the front plate for supporting the. arbors of the wheels and the posts of the frame-work of the alarm. Fig. 9 is a side view of the frame and its mechanism, the hell being shown in section.

My present inveniiiiin relates to improvements in that class of alarms for doors, &c., such as is represented and described in United States Patent No. 361,018, granted me on the 13th day of April, 1887.

In carrying out my present improvenwnts I do away with the iake-up spring K, (shown in said patent) and in place thereof I provide an arm, 0, secured to the arbor u, pivoted in the (lis [and in the back plate or bracket, if; alsol dispense wiihi'heback disk, 7;, of the frame G, (slnnvn in said patent,) and in place thereof make the l'aaok plate OJbIEtCliOli, 11, con stitute a part of the frame. to which are secured the posts)", and in which are pivoted the arhors oi the bell-striking mechanism; and instead of extinnling the actuating-wire E through a hole in the ear h, as in said pat out, i aiiarh it near the free end of ihe arm 0, thus gaining more leverage and doing away with the lfrieiion caused by said wire rnbljiing against the sides of the hole in ihe ear I). Said. ear ii in this case is formed as shown, and ihe upper inclined face thereof ci'mstituies a stop for the arm i) when depressed by the wire l). The arbor p of the spring for operating the train in this case is f extended beyond the outersnrlacooi? the disk 1 andis formed prisn'iatic, as shown,io admit of a key being applied 10 it to wind the spring 1 lturn its arbor p and ratcl quently the gear 0 will put in motion the la n- $erial No. 271.430. hi0 model.)

f, to increase its power in case it should be desirable to do so. in case the spring! should lose its power, by removing the hell from. its hearing, and loosening the set-screw of the arm u and applying a in? to the prismatic end of the arbor p it can he revolved to ini crease the tension of ihe spriin, t as may be required.

The back plat e or bracket, l, is mad c square or rectangular in shape, as represented, and is provided with screw-holes near its corners for securing it in position. it also chainbcred in its back, as shown in Fig. 2, so that it bears only at its edges against the surface to which it is or may be secured.

In some cases I apply to The frame and to the arm 0 a take-up spring, L, as shown, which operates to assist the spring tto return the arm 0 to the position shown in full lines in Fig. l, after it has been depressed into the position shown in dotted lines in said figure bythe aotuating-wire E. i

The arm 0 provided with a notch, y, in which the free end of the spring L bears, and said notch holds the said end of the spring in the position in which it will act to the best advantage on the arm and retains it in posi tion while the arm is being depressed.

In other respects the mechanism of this alarm is the same as ihat represented and d cscribcd in the patent hereinbeli'ore referred To, it having arranged on the arborp the gear 1.), rcvoluble thereon, the aetnating-spri11g attached to the arbor and to one of the posts! of the iirame, therai'chet r, fixed to said arbor, the pawl q, pivoted to the gear 0, and the spring I, secured thereto, and the arm 11, fixed to said arbor, a eonneci'ing-rod, r, joining the outer end of said arm '11 to the arm 0,218 shown. ()n the bell-knob being pulled out, the actnati ng-wiro i l, aiiachinl thereto, will depress the arm 0 inio the position shown in dotted lines in Il'ig. against the stop 1). (ionscqucnily iho arm n will. turn the arbor p, and ihe ratchet-wheel will move under its pawl s, and the spring I will be wound on its arbor. As soon as the bell-knob is released from the hand that pulled it the spring [will "t r, and conse tern-pinion n, fixed on the hub of the scapewheel g, and the rest of the train, by which the bell-hammer will be vibrated and caused to strike the bell successively a number of times, or till the free end of the arm 0 brings up against the escapement-arbor 71 From the above it will be seen that by my improvements I have reduced the number of parts of the mechanism, as shown and described in the patent referred to, and consequently have correspondingly reduced the cost of manufacture of the alarm, and by connecting the actuating-wire E near the free end of the arm 0 and arranging said wire outside of and away from the stop Z) have done away with much friction, and have provided an alarm which is simplified in construction and more easily operated than that hereinbefore referred to; therefore,

Having described my inventionavh at I claim in alarms for doors, &c., is+

1. The combination of the frame constructed as described and provided with the inclined stop, as shown, and having the bell-hammeroperative mechanism arranged therein, as represented, said mechanism consisting of the arbor p, mainspring i, and ratchet r,fixed pinion, scape-wheel, and shaft, the pallets and their shaft, with. the arm 0, pivoted in the frame connected with the arbor p of the mainspring by the arm a and link o, as shown, and having the actuating-wire E applied to it near its free end, all substantially as described and represented.

2. The combination of the frame constructed as described and provided with the inclined stop, and having the bell-hammer-operative mechanism arranged therein, essentially as set forth and represented, with the arm 0, pivoted in the frame, connected, as shown, with the mainspring-arbor p, by the arm a and link 1:, and the take-up spring L, secured to the frame and applied to the notch 3 of the arm 0, as represented, the actuating-wire be ing attached to the said arm near its free end,

all as shown, and for the purpose set forth.

3. The back plate,F, constructed as shown, and provided with the inclined stop, in combination'with a door-bell-alarm apparatus secured to said plate F and having the pivoted arm 0, and the stop limiting the movement of the arm, as and for the purpose set forth.

In testimony whereof I a l'iix m y 'si gn aturo in presence of two witnesses.

NAHUM J. BUSBY.

, \Vitnesses:

S. N. PIPER, PATRICK QUINN. 

